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Mike Kelly
Mike Kelly, Hyundai Mechanic
Category: Hyundai
Satisfied Customers: 278
Experience:  17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.
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I have a i20 classic and intermittantly during warm up phase

Customer Question

I have a i20 classic and intermittantly during warm up phase I get engine light flashing for few seconds when it warms up no issues. fault started 6 months ago and has had new spark plugs since and showed up a misfire cylinder 2 fault swapped cylinder 2 and 3 spark plugs clear faults , still happens still showing cylinder 2 misfire and random cylinder misfire faults , I always use shell fuel and even tried v+ still occurs i've also tried a fuel cleaner but still occurs its so intermittant but still very annoying. i have taken into a dealer but no help mainly due to the intermittant nature.

Submitted: 4 years ago.
Category: Hyundai
Expert:  indy-tech replied 4 years ago.
Hi .

How many miles do you have on this engine .

What spark plugs are you using .

What malfunction codes did you have

Rgds Greg.

Customer: replied 3 years ago.

The vehicle has covered 29,000 miles and has only ever had genuine spark plugs fitted but as the misfire is still shown on cylinder 2 after swapping cylinder 3 and 2 spark plugs can't see how it could be them. It seems that when the engine reaches operating temp and goes into close loop faze there's never a problem. fault code P0300 random cylinder misfire and P0302 cylinder 2 misfire, i can never get the misfire to occur while looking at it always on warm up phase while driving vehicle which is very frustrating!!.

Expert:  indy-tech replied 3 years ago.
Hi Daniel .

Seen this problem before and turned out to be the injectors ,
What i suggest you do is as you did with the spark plugs swap the misfiring cylinder No. 2 with cylinder No.4 . then test drive and then recheck for codes if the code changes to P0304 then replace that injector.
Remember to clear codes first before the test drive.

Do this then please get back to me .

Rgds Greg